2 * ASF compatible demuxer
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "mpegaudio.h"
30 #define FRAME_HEADER_SIZE 17
31 // Fix Me! FRAME_HEADER_SIZE may be different.
33 static const GUID index_guid = {
34 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
37 /**********************************/
43 #define PRINT_IF_GUID(g,cmp) \
44 if (!memcmp(g, &cmp, sizeof(GUID))) \
45 printf("(GUID: %s) ", #cmp)
47 static void print_guid(const GUID *g)
50 PRINT_IF_GUID(g, asf_header);
51 else PRINT_IF_GUID(g, file_header);
52 else PRINT_IF_GUID(g, stream_header);
53 else PRINT_IF_GUID(g, audio_stream);
54 else PRINT_IF_GUID(g, audio_conceal_none);
55 else PRINT_IF_GUID(g, video_stream);
56 else PRINT_IF_GUID(g, video_conceal_none);
57 else PRINT_IF_GUID(g, command_stream);
58 else PRINT_IF_GUID(g, comment_header);
59 else PRINT_IF_GUID(g, codec_comment_header);
60 else PRINT_IF_GUID(g, codec_comment1_header);
61 else PRINT_IF_GUID(g, data_header);
62 else PRINT_IF_GUID(g, index_guid);
63 else PRINT_IF_GUID(g, head1_guid);
64 else PRINT_IF_GUID(g, head2_guid);
65 else PRINT_IF_GUID(g, my_guid);
66 else PRINT_IF_GUID(g, ext_stream_header);
67 else PRINT_IF_GUID(g, extended_content_header);
68 else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
69 else PRINT_IF_GUID(g, ext_stream_audio_stream);
71 printf("(GUID: unknown) ");
73 printf(" 0x%02x,", (*g)[i]);
79 static void get_guid(ByteIOContext *s, GUID *g)
81 assert(sizeof(*g) == 16);
82 get_buffer(s, g, sizeof(*g));
86 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
95 if ((q - buf) < buf_size - 1)
103 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
114 static int asf_probe(AVProbeData *pd)
116 /* check file header */
117 if (pd->buf_size <= 32)
120 if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
121 return AVPROBE_SCORE_MAX;
126 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
128 ASFContext *asf = s->priv_data;
130 ByteIOContext *pb = &s->pb;
137 if (memcmp(&g, &asf_header, sizeof(GUID)))
143 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
146 gsize = get_le64(pb);
148 printf("%08"PRIx64": ", url_ftell(pb) - 24);
150 printf(" size=0x%"PRIx64"\n", gsize);
154 if (!memcmp(&g, &file_header, sizeof(GUID))) {
155 get_guid(pb, &asf->hdr.guid);
156 asf->hdr.file_size = get_le64(pb);
157 asf->hdr.create_time = get_le64(pb);
158 asf->nb_packets = get_le64(pb);
159 asf->hdr.send_time = get_le64(pb);
160 asf->hdr.play_time = get_le64(pb);
161 asf->hdr.preroll = get_le32(pb);
162 asf->hdr.ignore = get_le32(pb);
163 asf->hdr.flags = get_le32(pb);
164 asf->hdr.min_pktsize = get_le32(pb);
165 asf->hdr.max_pktsize = get_le32(pb);
166 asf->hdr.max_bitrate = get_le32(pb);
167 asf->packet_size = asf->hdr.max_pktsize;
168 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
169 int type, type_specific_size, sizeX;
173 int test_for_ext_stream_audio;
175 pos1 = url_ftell(pb);
177 st = av_new_stream(s, 0);
180 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
181 asf_st = av_mallocz(sizeof(ASFStream));
184 st->priv_data = asf_st;
185 st->start_time = asf->hdr.preroll;
186 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
187 st->duration = asf->hdr.send_time /
188 (10000000 / 1000) - st->start_time;
192 test_for_ext_stream_audio = 0;
193 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
194 type = CODEC_TYPE_AUDIO;
195 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
196 type = CODEC_TYPE_VIDEO;
197 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
198 type = CODEC_TYPE_UNKNOWN;
199 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
200 test_for_ext_stream_audio = 1;
201 type = CODEC_TYPE_UNKNOWN;
206 total_size = get_le64(pb);
207 type_specific_size = get_le32(pb);
209 st->id = get_le16(pb) & 0x7f; /* stream id */
210 // mapping of asf ID to AV stream ID;
211 asf->asfid2avid[st->id] = s->nb_streams - 1;
215 if (test_for_ext_stream_audio) {
217 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
218 type = CODEC_TYPE_AUDIO;
228 st->codec->codec_type = type;
229 if (type == CODEC_TYPE_AUDIO) {
230 get_wav_header(pb, st->codec, type_specific_size);
231 st->need_parsing = 1;
232 /* We have to init the frame size at some point .... */
233 pos2 = url_ftell(pb);
234 if (gsize > (pos2 + 8 - pos1 + 24)) {
235 asf_st->ds_span = get_byte(pb);
236 asf_st->ds_packet_size = get_le16(pb);
237 asf_st->ds_chunk_size = get_le16(pb);
238 get_le16(pb); //ds_data_size
239 get_byte(pb); //ds_silence_data
241 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
242 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
243 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
244 if (asf_st->ds_span > 1) {
245 if (!asf_st->ds_chunk_size
246 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
247 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
248 asf_st->ds_span = 0; // disable descrambling
250 switch (st->codec->codec_id) {
252 st->codec->frame_size = MPA_FRAME_SIZE;
254 case CODEC_ID_PCM_S16LE:
255 case CODEC_ID_PCM_S16BE:
256 case CODEC_ID_PCM_U16LE:
257 case CODEC_ID_PCM_U16BE:
258 case CODEC_ID_PCM_S8:
259 case CODEC_ID_PCM_U8:
260 case CODEC_ID_PCM_ALAW:
261 case CODEC_ID_PCM_MULAW:
262 st->codec->frame_size = 1;
265 /* This is probably wrong, but it prevents a crash later */
266 st->codec->frame_size = 1;
269 } else if (type == CODEC_TYPE_VIDEO) {
273 size = get_le16(pb); /* size */
274 sizeX= get_le32(pb); /* size */
275 st->codec->width = get_le32(pb);
276 st->codec->height = get_le32(pb);
277 /* not available for asf */
278 get_le16(pb); /* panes */
279 st->codec->bits_per_sample = get_le16(pb); /* depth */
282 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
285 st->codec->extradata_size = size - 40;
286 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
287 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
290 /* Extract palette from extradata if bpp <= 8 */
291 /* This code assumes that extradata contains only palette */
292 /* This is true for all paletted codecs implemented in ffmpeg */
293 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
294 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
295 #ifdef WORDS_BIGENDIAN
296 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
297 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
299 memcpy(st->codec->palctrl->palette, st->codec->extradata,
300 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
302 st->codec->palctrl->palette_changed = 1;
305 st->codec->codec_tag = tag1;
306 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
307 if(tag1 == MKTAG('D', 'V', 'R', ' '))
308 st->need_parsing = 1;
310 pos2 = url_ftell(pb);
311 url_fskip(pb, gsize - (pos2 - pos1 + 24));
312 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
313 asf->data_object_offset = url_ftell(pb);
314 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
315 if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
316 asf->data_object_size = gsize - 24;
318 asf->data_object_size = (uint64_t)-1;
321 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
322 int len1, len2, len3, len4, len5;
329 get_str16_nolen(pb, len1, s->title , sizeof(s->title));
330 get_str16_nolen(pb, len2, s->author , sizeof(s->author));
331 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
332 get_str16_nolen(pb, len4, s->comment , sizeof(s->comment));
334 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
337 desc_count = get_le16(pb);
338 for(i=0;i<desc_count;i++)
340 int name_len,value_type,value_len;
341 uint64_t value_num = 0;
344 name_len = get_le16(pb);
345 get_str16_nolen(pb, name_len, name, sizeof(name));
346 value_type = get_le16(pb);
347 value_len = get_le16(pb);
348 if ((value_type == 0) || (value_type == 1)) // unicode or byte
350 if (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
351 else if(!strcmp(name,"WM/Genre" )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
352 else url_fskip(pb, value_len);
354 if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
356 if (value_type==2) value_num = get_le32(pb);
357 if (value_type==3) value_num = get_le32(pb);
358 if (value_type==4) value_num = get_le64(pb);
359 if (value_type==5) value_num = get_le16(pb);
360 if (!strcmp(name,"WM/Track" )) s->track = value_num + 1;
361 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
364 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
365 int ext_len, payload_ext_ct, stream_ct;
368 pos_ex_st = url_ftell(pb);
383 stream_ct = get_le16(pb);
384 payload_ext_ct = get_le16(pb);
386 for (i=0; i<stream_ct; i++){
388 ext_len = get_le16(pb);
389 url_fseek(pb, ext_len, SEEK_CUR);
392 for (i=0; i<payload_ext_ct; i++){
395 ext_len=get_le32(pb);
396 url_fseek(pb, ext_len, SEEK_CUR);
399 // there could be a optional stream properties object to follow
400 // if so the next iteration will pick it up
401 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
407 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
417 num = get_le16(pb); /* stream number */
418 get_str16(pb, str, sizeof(str));
419 get_str16(pb, str, sizeof(str));
424 if ((q - tag) < sizeof(tag) - 1)
431 } else if (url_feof(pb)) {
434 url_fseek(pb, gsize - 24, SEEK_CUR);
443 asf->data_offset = url_ftell(pb);
444 asf->packet_size_left = 0;
449 for(i=0;i<s->nb_streams;i++) {
450 AVStream *st = s->streams[i];
452 av_free(st->priv_data);
453 av_free(st->codec->extradata);
460 #define DO_2BITS(bits, var, defval) \
463 case 3: var = get_le32(pb); rsize += 4; break; \
464 case 2: var = get_le16(pb); rsize += 2; break; \
465 case 1: var = get_byte(pb); rsize++; break; \
466 default: var = defval; break; \
469 static int asf_get_packet(AVFormatContext *s)
471 ASFContext *asf = s->priv_data;
472 ByteIOContext *pb = &s->pb;
473 uint32_t packet_length, padsize;
480 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
482 if ((c & 0x0f) == 2) { // always true for now
483 if (get_le16(pb) != 0) {
485 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
491 printf("ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
495 asf->packet_flags = get_byte(pb);
496 asf->packet_property = get_byte(pb);
498 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
499 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
500 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
502 //the following checks prevent overflows and infinite loops
503 if(packet_length >= (1U<<29)){
504 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
507 if(padsize >= (1U<<29)){
508 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
512 asf->packet_timestamp = get_le32(pb);
513 get_le16(pb); /* duration */
514 // rsize has at least 11 bytes which have to be present
516 if (asf->packet_flags & 0x01) {
517 asf->packet_segsizetype = get_byte(pb); rsize++;
518 asf->packet_segments = asf->packet_segsizetype & 0x3f;
520 asf->packet_segments = 1;
521 asf->packet_segsizetype = 0x80;
523 asf->packet_size_left = packet_length - padsize - rsize;
524 if (packet_length < asf->hdr.min_pktsize)
525 padsize += asf->hdr.min_pktsize - packet_length;
526 asf->packet_padsize = padsize;
528 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
535 * @return <0 if error
537 static int asf_read_frame_header(AVFormatContext *s){
538 ASFContext *asf = s->priv_data;
539 ByteIOContext *pb = &s->pb;
541 int num = get_byte(pb);
543 asf->packet_segments--;
544 asf->packet_key_frame = num >> 7;
545 asf->stream_index = asf->asfid2avid[num & 0x7f];
546 // sequence should be ignored!
547 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
548 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
549 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
550 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
551 if (asf->packet_replic_size >= 8) {
552 asf->packet_obj_size = get_le32(pb);
553 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
554 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
557 asf->packet_frag_timestamp = get_le32(pb); // timestamp
558 url_fskip(pb, asf->packet_replic_size - 8);
559 rsize += asf->packet_replic_size; // FIXME - check validity
560 } else if (asf->packet_replic_size==1){
561 // multipacket - frag_offset is begining timestamp
562 asf->packet_time_start = asf->packet_frag_offset;
563 asf->packet_frag_offset = 0;
564 asf->packet_frag_timestamp = asf->packet_timestamp;
566 asf->packet_time_delta = get_byte(pb);
568 }else if(asf->packet_replic_size!=0){
569 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
572 if (asf->packet_flags & 0x01) {
573 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
574 if(asf->packet_frag_size > asf->packet_size_left - rsize){
575 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
578 //printf("Fragsize %d\n", asf->packet_frag_size);
580 asf->packet_frag_size = asf->packet_size_left - rsize;
581 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
583 if (asf->packet_replic_size == 1) {
584 asf->packet_multi_size = asf->packet_frag_size;
585 if (asf->packet_multi_size > asf->packet_size_left)
588 asf->packet_size_left -= rsize;
589 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
594 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
596 ASFContext *asf = s->priv_data;
597 ASFStream *asf_st = 0;
598 ByteIOContext *pb = &s->pb;
603 if (asf->packet_size_left < FRAME_HEADER_SIZE
604 || asf->packet_segments < 1) {
605 //asf->packet_size_left <= asf->packet_padsize) {
606 int ret = asf->packet_size_left + asf->packet_padsize;
607 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
612 ret= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size;
613 if(asf->hdr.max_pktsize == asf->hdr.min_pktsize && ret){
614 av_log(s, AV_LOG_ERROR, "packet end missaligned skiping %d\n", ret);
615 url_fskip(pb, asf->packet_size - ret);
618 asf->packet_pos= url_ftell(&s->pb);
619 if (asf->data_object_size != (uint64_t)-1 &&
620 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
621 return AVERROR_IO; /* Do not exceed the size of the data object */
622 ret = asf_get_packet(s);
623 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
625 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
626 asf->packet_time_start = 0;
629 if (asf->packet_time_start == 0) {
630 if(asf_read_frame_header(s) < 0){
631 asf->packet_segments= 0;
634 if (asf->stream_index < 0
635 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
636 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
638 asf->packet_time_start = 0;
639 /* unhandled packet (should not happen) */
640 url_fskip(pb, asf->packet_frag_size);
641 asf->packet_size_left -= asf->packet_frag_size;
642 if(asf->stream_index < 0)
643 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
646 asf->asf_st = s->streams[asf->stream_index]->priv_data;
648 asf_st = asf->asf_st;
650 if (asf->packet_replic_size == 1) {
651 // frag_offset is here used as the begining timestamp
652 asf->packet_frag_timestamp = asf->packet_time_start;
653 asf->packet_time_start += asf->packet_time_delta;
654 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
655 asf->packet_size_left--;
656 asf->packet_multi_size--;
657 if (asf->packet_multi_size < asf->packet_obj_size)
659 asf->packet_time_start = 0;
660 url_fskip(pb, asf->packet_multi_size);
661 asf->packet_size_left -= asf->packet_multi_size;
664 asf->packet_multi_size -= asf->packet_obj_size;
665 //printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
667 if (asf_st->pkt.size != asf->packet_obj_size) { //FIXME is this condition sufficient?
668 if(asf_st->pkt.data){
669 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
670 asf_st->frag_offset = 0;
671 av_free_packet(&asf_st->pkt);
674 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
675 asf_st->seq = asf->packet_seq;
676 asf_st->pkt.pts = asf->packet_frag_timestamp;
677 asf_st->pkt.stream_index = asf->stream_index;
679 asf_st->packet_pos= asf->packet_pos;
680 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
681 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
682 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
683 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
684 asf->packet_key_frame = 1;
685 if (asf->packet_key_frame)
686 asf_st->pkt.flags |= PKT_FLAG_KEY;
690 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
691 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
692 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
693 asf->packet_size_left -= asf->packet_frag_size;
694 if (asf->packet_size_left < 0)
697 if( asf->packet_frag_offset >= asf_st->pkt.size
698 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
699 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
700 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
704 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
705 asf->packet_frag_size);
706 asf_st->frag_offset += asf->packet_frag_size;
707 /* test if whole packet is read */
708 if (asf_st->frag_offset == asf_st->pkt.size) {
710 if (asf_st->ds_span > 1) {
711 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
712 av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
714 /* packet descrambling */
715 uint8_t *newdata = av_malloc(asf_st->pkt.size);
718 while (offset < asf_st->pkt.size) {
719 int off = offset / asf_st->ds_chunk_size;
720 int row = off / asf_st->ds_span;
721 int col = off % asf_st->ds_span;
722 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
723 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
725 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
726 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
727 memcpy(newdata + offset,
728 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
729 asf_st->ds_chunk_size);
730 offset += asf_st->ds_chunk_size;
732 av_free(asf_st->pkt.data);
733 asf_st->pkt.data = newdata;
737 asf_st->frag_offset = 0;
739 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
740 asf_st->pkt.size = 0;
741 asf_st->pkt.data = 0;
742 break; // packet completed
748 static int asf_read_close(AVFormatContext *s)
752 for(i=0;i<s->nb_streams;i++) {
753 AVStream *st = s->streams[i];
754 av_free(st->priv_data);
755 av_free(st->codec->palctrl);
760 // Added to support seeking after packets have been read
761 // If information is not reset, read_packet fails due to
762 // leftover information from previous reads
763 static void asf_reset_header(AVFormatContext *s)
765 ASFContext *asf = s->priv_data;
769 asf->packet_nb_frames = 0;
770 asf->packet_size_left = 0;
771 asf->packet_segments = 0;
772 asf->packet_flags = 0;
773 asf->packet_property = 0;
774 asf->packet_timestamp = 0;
775 asf->packet_segsizetype = 0;
776 asf->packet_segments = 0;
778 asf->packet_replic_size = 0;
779 asf->packet_key_frame = 0;
780 asf->packet_padsize = 0;
781 asf->packet_frag_offset = 0;
782 asf->packet_frag_size = 0;
783 asf->packet_frag_timestamp = 0;
784 asf->packet_multi_size = 0;
785 asf->packet_obj_size = 0;
786 asf->packet_time_delta = 0;
787 asf->packet_time_start = 0;
789 for(i=0; i<s->nb_streams; i++){
790 asf_st= s->streams[i]->priv_data;
791 av_free_packet(&asf_st->pkt);
792 asf_st->frag_offset=0;
798 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
800 ASFContext *asf = s->priv_data;
801 AVPacket pkt1, *pkt = &pkt1;
806 int64_t start_pos[s->nb_streams];
808 for(i=0; i<s->nb_streams; i++){
812 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
814 url_fseek(&s->pb, pos, SEEK_SET);
816 //printf("asf_read_pts\n");
819 if (av_read_frame(s, pkt) < 0){
820 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
821 return AV_NOPTS_VALUE;
827 if(pkt->flags&PKT_FLAG_KEY){
828 i= pkt->stream_index;
830 asf_st= s->streams[i]->priv_data;
832 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
833 pos= asf_st->packet_pos;
835 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
836 start_pos[i]= asf_st->packet_pos + 1;
838 if(pkt->stream_index == stream_index)
844 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
849 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
852 ASFContext *asf = s->priv_data;
853 int64_t gsize, itime;
854 int64_t pos, current_pos, index_pts;
858 current_pos = url_ftell(&s->pb);
860 url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
861 get_guid(&s->pb, &g);
862 if (!memcmp(&g, &index_guid, sizeof(GUID))) {
863 gsize = get_le64(&s->pb);
864 get_guid(&s->pb, &g);
865 itime=get_le64(&s->pb);
866 pct=get_le32(&s->pb);
867 ict=get_le32(&s->pb);
868 av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
871 int pktnum=get_le32(&s->pb);
872 int pktct =get_le16(&s->pb);
873 av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
875 pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
876 index_pts=av_rescale(itime, i, 10000);
878 av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
882 url_fseek(&s->pb, current_pos, SEEK_SET);
885 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
887 ASFContext *asf = s->priv_data;
888 AVStream *st = s->streams[stream_index];
892 if (asf->packet_size <= 0)
895 if (!asf->index_read)
896 asf_build_simple_index(s, stream_index);
898 if(!(asf->index_read && st->index_entries)){
899 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
902 index= av_index_search_timestamp(st, pts, flags);
906 /* find the position */
907 pos = st->index_entries[index].pos;
908 pts = st->index_entries[index].timestamp;
910 // various attempts to find key frame have failed so far
911 // asf_reset_header(s);
912 // url_fseek(&s->pb, pos, SEEK_SET);
914 // for(i=0;i<16;i++){
915 // pos = url_ftell(&s->pb);
916 // if (av_read_frame(s, &pkt) < 0){
917 // av_log(s, AV_LOG_INFO, "seek failed\n");
920 // asf_st = s->streams[stream_index]->priv_data;
921 // pos += st->parser->frame_offset;
923 // if (pkt.size > b) {
928 // av_free_packet(&pkt);
932 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
933 url_fseek(&s->pb, pos, SEEK_SET);
939 AVInputFormat asf_demuxer = {